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Diagnostic is run and a POST error will appear if the diagnostic fails.

Via pressing the blue Access IBM button on the keyboard during boot and choosing the Run Diagnostics option. Once PC Doctor for DOS starts, go the to the Other Devices option under the Diagnostics menu and run the hard drive Active Protection Test.

Bring up the Hard Dive Protection Interface from Control Panel or the Task Tray icon once the operating system is booted up. You can then go to the Real-time Status tab and the ThinkPad icon should move when the ThinkPad is moved.